Kryptochroma quadrata Machado & Viecelli, 2021

Machado, Miguel, Viecelli, Rafaela, Guzati, Catherine, Grismado, Cristian J. & Teixeira, Renato A., 2021, Kryptochroma: a new genus of bark-dwelling crab spiders (Araneae, Thomisidae), European Journal of Taxonomy 778, pp. 26-70 : 48-51

publication ID

https://doi.org/10.5852/ejt.2021.778.1565

publication LSID

lsid:zoobank.org:pub:4AFEC628-D555-44BD-8592-3A338694885F

DOI

https://doi.org/10.5281/zenodo.5686956

persistent identifier

https://treatment.plazi.org/id/6C2037C9-66B3-4B07-9102-E2BF009B8AC1

taxon LSID

lsid:zoobank.org:act:6C2037C9-66B3-4B07-9102-E2BF009B8AC1

treatment provided by

Felipe

scientific name

Kryptochroma quadrata Machado & Viecelli
status

gen. et sp. nov.

Kryptochroma quadrata Machado & Viecelli gen. et sp. nov.

urn:lsid:zoobank.org:act:6C2037C9-66B3-4B07-9102-E2BF009B8AC1

Figs 12–13 View Fig View Fig , 18, 19B, 22B

Diagnosis

The male of K. quadrata sp. nov. resembles that of K. pentacantha by the shape and disposition of embolus ( Figs 13C, E View Fig , 19B), however, it can be distinguished from that and other species of the genus by the rounded tegulum, which also presents a retrolateral reentrance, and by the squared-tipped RTA with remarkable grooved surface ( Figs 13D, F View Fig , 19B). The females have an anterior longitudinal ruckle connected to a shallow and convex fold on the epigynal plate, with no median outgrowth, gutters or septum separating the copulatory openings ( Figs 12C, E View Fig , 22B View Fig ).

Etymology

The epithet – a Latin feminine adjective that means squared – is a direct reference to the shape of the RTA tip, which ends abruptly.

Material examined

Holotype BRAZIL • ♂; Amazonas, Coari, Porto Urucu , Base de Operações Geólogo Pedro de Moura ; 4°53′42.5″ S, 65°11′18.2″ W; 28 Sep. 2006; C.A.C. Santos Jr. leg.; UFMG 22673 View Materials . GoogleMaps

Paratypes BRAZIL • 1 ♀; same collection data as for holotype; MPEG 22669 View Materials GoogleMaps 1 ♀; same locality as for preceding; 4°50′01″ S, 65°03′53″ W; 28 Sep. 2006; D. Guimarães leg.; UFMG 22673 View Materials GoogleMaps 1 ♀, same collection data as for preceding; Sep. 2006; D. Candiani leg.; MPEG 13297 View Materials GoogleMaps .

Additional material

None.

Description

Female (paratype, MPEG 13297)

PROSOMA. Anterior eye row strongly recurved and posterior procurve, ocular mounds discrete, not as elevated as in other species, carapace predominantly yellow, black on the sides, MS well developed ( Fig. 12A–B View Fig ). Chelicerae yellow with two pairs of dark stains, sternum slightly longer than wide, brown with a large yellow stain, endites and labium truncated and totally brown.

LEGS. Leg coloration pattern as in K. gigas gen. et sp. nov.

OPISTHOSOMA. Concave anterior border, predominantly yellow, dark-brown on sides and on the back of the abdominal projections ( Fig. 12A View Fig ). Spermathecae rounded and smooth surfaced ( Fig. 12D, F View Fig ).

MEASUREMENTS. Eye diameters and eye interdistances: AME 0.06, ALE 0.11, PME 0.08, PLE 0.08, AME–AME 0.12, AME–ALE 0.16, PME–PME 0.27, PME–PLE 0.09, MOQ length 0.48, MOQ width 0.51; leg formula: 1-2-4-3: leg I – femur 5.18/ patella 2.59/ tibiae 3.47/ metatarsus 2.07/ tarsus 1.39/ total 14.70; II – 4.14/ 2.33/ 2.84/ 1.81/ 1.29/ 9.57; III – 2.33/ 1.29/ 2.07/ 1.03/ 0.88/ 7.60; IV – 2.90/ 1.29/ 1.91/ 1.24/ 0.93/ 8.27. Total body length 7.25; carapace 3.50 length, 3.37 wide; opisthosoma

length 3.75; clypeus 0.32 height; sternum 1.53 length, 1.29 width; endites 0.80 length, 0.40 width; labium 0.56 length, 0.58 width.

Male (holotype, MPEG 22673)

PROSOMA. Anterior eye row very recurved, posterior procurved, ALE with almost two times the size of AME; carapace knobby, predominantly light brown with its median region, clypeus and posterior slope scars yellowish; medial spire absent ( Fig. 13A–B View Fig ). Sternum scutiform, light brown with a median white stain.

LEGS. Anterior legs light brown with some darker taints while legs III and IV are lighter, with extensive whitish areas; anterior femora enlarged, with dorsolateral setiferous tubercles randomly distributed and ventral region dark-brown; tibia I and II with four pairs of ventral macrosetae and anterior metatarsi with three pairs ( Fig. 13A View Fig ).

OPISTHOSOMA. Predominantly pale yellow with small white punctuations and posterior black spots; straight anterior border and five short spiniform projections.

MEASUREMENTS. Eye diameters and eye interdistances: AME 0.06, ALE 0.08, PME 0.06, PLE 0.06, AME– AME 0.06, AME–ALE 0.08, PME–PME 0.16, PME–PLE 0.06, MOQ length 0.29, MOQ width 0.32; leg formula: 1-2-4-3: leg I – femur 2.23/ patella 1.24/ tibiae 1.33/ metatarsus 0.88/ tarsus 0.56/ total 6.24; II –

1.45/ 0.72/ 1.04/ 0.72/ 0.50/ 4.43; III – 0.87/ 0.48/ 0.80/ 0.45/ 0.37/ 2.97; IV – 1.12/ 0.48/ 0.80/ 0.56/ 0.40/ 3.36. Total body length 4.61; carapace 2.28 length, 2.18 width; opisthosoma length 2.33; clypeus 0.24 height; sternum 0.83 length, 0.72 width; endites 0.40 length, 0.24 width; labium 0.20 length, 0.32 width.

Distribution

Brazil (Amazonas) ( Fig. 18 View Fig ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Thomisidae

Genus

Kryptochroma